UMBELLIFERONE

\ˌʌmbɪlˈɪfəɹˌə͡ʊn], \ˌʌmbɪlˈɪfəɹˌə‍ʊn], \ˌʌ_m_b_ɪ_l_ˈɪ_f_ə_ɹ_ˌəʊ_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1900 - A dictionary of medicine and the allied sciences
By Alexander Duane